JP2016085355A - Display object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display object having various display properties according to the presence or absence of a point light source, regardless of a simple configuration and to provide a security medium, a window, and a lighting apparatus which include the display object.SOLUTION: A display object 10 includes a plurality of display areas 12 and 13a to 13c. In the display areas adjacent to each other, at least one of an average hue, average brightness, and average color saturation is different. A first display object 21 is formed by the combination of the plurality of display areas 12 and 13a to 13c. At least one of the display areas 12 and 13a to 13c includes Fourier-transform holograms 20R and 20Y for transforming light made incident from the point light source into the optical image of a second display object.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display object having various design properties depending on the presence or absence of a point light source. The present invention also relates to a security medium, a window, and a lighting fixture provided with the display object.

  A hologram is recorded on a photosensitive material by causing two light beams (object light and reference light) having the same wavelength to interfere with each other and the wave front of the object light as interference fringes. The pattern of interference fringes to be formed on the hologram is calculated based on the planned wavelength and incident direction of the reproduction illumination light and the shape and position of the image to be reproduced without using the actual object light and reference light. You may design using. The hologram obtained in this way is also called a computer generated hologram (CGH).

  When these holograms are irradiated with light having the same conditions as the original reference light, a diffraction phenomenon due to interference fringes occurs, and the same wavefront as the original object light is reproduced. Among them, the Fourier transform hologram has a unique property that incident light is converted into a predetermined image by light irradiation from a point light source and is expressed as a light image. Reference 1 and Patent Document 2).

  By the way, when a Fourier transform hologram is irradiated with light from a surface light source or a line light source, the above-described conversion of incident light occurs over the entire surface light source or line light source. The image is superimposed along the shape of the surface light source or the line light source, and the information of the original image cannot be expressed as a light image. That is, when a display body or the like provided with the Fourier transform hologram is used in a place where there is no point light source or laser light source, an optical image is not expressed on the Fourier transform hologram, so that an observer can recognize the information on the optical image. Can not.

  Further, in order to express the optical image in a transmission type Fourier transform hologram, the Fourier transform hologram itself is required to have high light transmittance. Therefore, when a design or the like that is different from the optical image expressed in the Fourier transform hologram and can be displayed without the need of a point light source or a laser light source is applied to the display body, it is usually printed on an area that does not overlap with the Fourier transform hologram. It is necessary to provide it. That is, on the Fourier transform hologram, only a light image expressed by light irradiation from a point light source or a laser light source can be displayed.

  Thus, when not receiving the light irradiation from a point light source or a laser light source, there exists a problem that a Fourier-transform hologram is a thing with a poor design property.

JP 2007-011156 A JP 2007-041545 A

  The present applicant has already proposed a laminate provided such that the embossed hologram portion and the transparent printing portion overlap each other (Japanese Patent Application No. 2013-104397). According to this laminate, when receiving light from a point light source, a light image is reproduced by the embossed hologram part. When not receiving light from a point light source, the design by the transparent printing part is displayed. The Therefore, it can be set as the hologram body which has various design properties according to the presence or absence of a point light source. However, in this laminate, in order to provide two design properties, it is necessary to prepare two optical mechanisms, that is, an embossed hologram portion and a transparent printing portion, respectively.

  The present invention has been made in consideration of such points. SUMMARY OF THE INVENTION An object of the present invention is to provide a display object having a variety of display properties according to the presence or absence of a point light source or a laser light source, and a security medium, a window, and a lighting fixture provided with the display object. There is.

The display according to the present invention is
With multiple display areas,
The display areas adjacent to each other are different in at least one of average hue, average brightness, and average saturation, and a first display object is formed by a combination of the plurality of display areas.
The at least one display area includes a Fourier transform hologram that converts light incident from a point light source or a laser light source into a second display object.
In the display according to the present invention, the Fourier transform hologram may be an amplitude hologram.
In the display object according to the present invention, the number of the display areas may be three or more.
The security medium according to the present invention includes any of the display objects according to the present invention described above.
The window according to the present invention includes any of the display objects according to the present invention described above.
The lighting fixture according to the present invention includes any of the display objects according to the present invention described above.

According to the present invention, it is possible to have various design properties according to the presence or absence of a point light source or a laser light source while having a simple configuration.
Further, according to the security medium of the present invention, extremely high security can be ensured.

FIG. 1A is a plan view showing a display object according to an embodiment of the present invention. FIG.1 (b) is a figure which expands and shows a part of one display area in the display thing of Fig.1 (a). FIG.1 (c) is a figure which expands and shows a part of another display area in the display thing of Fig.1 (a). FIG. 2 is a view showing a cross section cut along the line AA of the display object of FIG. FIG. 3 is a diagram for explaining a display target displayed by the display object of FIG. 1A using light from a surface light source. FIG. 4 is a diagram for explaining a display target displayed by the display object of FIG. 1A using light from a point light source. FIG. 4B is a diagram for explaining a display target displayed by the display object of FIG. 1A using light from a laser light source. FIGS. 5A to 5D are diagrams for explaining a method of creating the display object in FIG. FIGS. 6A to 6F are diagrams for explaining a method of creating the display object in FIG. FIGS. 7A to 7C are diagrams corresponding to FIGS. 1A to 1C and are diagrams for explaining a modification of the display object. FIG. 8 is a diagram for explaining a display target displayed by a modification of the display object in FIG. 1A under diffused light. FIG. 9 is a diagram for explaining a display target displayed by a modification of the display object in FIG. 1A using light from a laser light source. FIG. 10 is a diagram showing an example of a security medium provided with the display object of FIG. FIGS. 11A and 11B are diagrams illustrating an example of a window provided with the display object of FIG. FIGS. 12A and 12B are diagrams showing an example of a lighting fixture provided with the display object of FIG.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that, in the drawings attached to the present specification, for the sake of easy understanding of the drawings, the scale and the vertical / horizontal dimension ratio are appropriately changed and exaggerated from those of the actual ones.

  FIG. 1A is a plan view showing a display object according to an embodiment of the present invention. FIG.1 (b) is a figure which expands and shows a part of one display area in the display thing of Fig.1 (a). FIG.1 (c) is a figure which expands and shows a part of another display area in the display thing of Fig.1 (a). FIG. 2 is a view showing a cross section cut along the line AA of the display object of FIG.

  As shown in FIGS. 1A to 1C and FIG. 2, a display object 10 according to the present embodiment includes a transparent substrate 11 and a plurality of (in the illustrated example) provided on the transparent substrate 11. 4) display areas 12, 13a to 13c.

  Among these, the transparent base material 11 is for supporting the some display area 12, 13a-13c. Here, “transparent” in the transparent substrate 11 includes “semi-transparent” and means that it has transparency to the extent that light from a point light source can be transmitted.

  The transparent substrate 11 preferably has a higher transmittance in the visible light region (hereinafter sometimes referred to as a light transmittance). Specifically, for example, the light transmittance is preferably 80% or more. Of these, 90% or more is more preferable. By setting the light transmittance of the transparent substrate 11 within the above-described range, light can be sufficiently transmitted to the display areas 12, 13a to 13c, and the display objects displayed by the display areas 12, 13a to 13c. It is because it becomes easy to be visually recognized. In this specification, “light transmittance” refers to a value measured according to JIS K7361-1.

  In addition, the transparent substrate 11 is preferably as the haze value is low, and specifically, for example, those having a haze value in the range of 0.01% to 5% are preferable. Is preferably within the range of 0.01% to 1.5%. This is because by setting the haze value of the transparent base material 11 within the above-described range, it is possible to display the display target in each of the display regions 12 and 13a to 13c without impairing the visibility. In the present specification, the “haze value” refers to a value measured according to JIS K7136.

  The material of the transparent substrate 11 is not particularly limited as long as it exhibits the above light transmittance and haze value. For example, polyethylene terephthalate, polycarbonate, acrylic resin, cycloolefin resin, polyester resin, polystyrene resin, Resin films such as acrylic styrene resin, glass such as quartz glass, Pyrex (registered trademark), and synthetic quartz plate can be used. Among these, as the transparent substrate 11, it is preferable to use a resin film from the viewpoint of light weight and less risk of breakage and the like, and polycarbonate is most suitable from the viewpoint of birefringence.

  The transparent substrate 11 may contain a flame retardant. This is because the display object 10 according to the present embodiment can also be used in applications that require flame retardancy such as lighting equipment. Examples of the flame retardant include any flame retardant such as phosphorus flame retardant, nitrogen flame retardant, metal salt flame retardant, hydroxide flame retardant, antimony flame retardant and the like, and silicone flame retardant. A flame retardant can be used. In addition, about the addition amount of a flame retardant, what is necessary is just the quantity which the transparent base material 11 can show desired light transmittance and a haze value, and can be set suitably.

  Moreover, the transparent base material 11 may contain a ultraviolet absorber, a heat ray absorber, etc. This is because deterioration of the display areas 12, 13a to 13c due to exposure to ultraviolet rays and heat rays is suppressed, and the display object 10 according to the present embodiment can be used as an ultraviolet absorption filter, a heat ray cut filter, or the like. .

  The film thickness of the transparent substrate 11 may be a thickness that can have rigidity and strength for supporting the display regions 12, 13 a to 13 c, and the like, for example, about 0.005 mm to 5 mm. Among these, it is preferable that the thickness is in the range of 0.02 mm to 1 mm. Moreover, the shape of the transparent base material 11 is not specifically limited, According to the usage type of the display thing 10, it can select suitably.

  The transparent substrate 11 may be subjected, for example, to corona treatment on the surface in order to improve adhesion with other layers.

  Next, the structure of the display areas 12, 13a to 13c will be described. In the following description, the display areas 12, 13a to 13c may be referred to as first to fourth display areas 12, 13a to 13c.

  As shown in FIG. 1A, among the plurality of display areas 12, 13a to 13c, adjacent display areas are different in at least one of average hue, average lightness, and average saturation, and display a plurality of displays. The first display object 21 is formed by a combination of the regions 12 and 13a to 13c.

  Here, strictly speaking, the average hue, the average brightness, and the average saturation in each of the display areas 12, 13a to 13c are measured for all points in the target display area using a colorimeter or a spectrocolorimeter. The hue, brightness, and saturation are examined and the average value is calculated. In practice, however, the degree of variation of the objects to be investigated within a section with an area that can be expected to reflect the overall trend of the objects to be investigated (hue, lightness, and saturation). It can be specified by calculating the average value after examining the number considered appropriate. For example, in one target display area 12, 13a to 13c, 30 locations included in a 30 mm × 30 mm area are measured by a colorimeter or a spectrocolorimeter, and the average is calculated. The average hue, average lightness, and average saturation of 13a to 13c can be specified.

The difference between the average hue, the average brightness, or the average saturation in the display areas adjacent to each other is not limited as long as the observer can distinguish and visually recognize the display areas adjacent to each other. It can be determined accordingly. Specifically, for example, the color difference ΔE ^* _ab in the L ^* a ^* b ^* color system defined in JIS Z8781-4: 2013 can be two or more different colors.

  In the illustrated example, a first display object 21 representing a human face illustration is formed by a combination of the first to fourth display areas 12 and 13a to 13c. More specifically, the first display area 12 has a circular shape, and the average hue is yellow. The first display area 12 corresponds to the outline of a human face in the first display object 21. The second display area 13a and the third display area 13b have a smaller circular shape than the first display area 12, and the average hue is red. The second display area 13 a and the third display area 13 b are arranged side by side inside the first display area 12, and correspond to the left and right eyes of a human face in the first display object 21. The fourth display area 13c has an elliptical shape, and the average hue is red. The fourth display area 13c is arranged so as to extend to the left and right inside the first display area 12 and below the second display area 13a and the third display area 13b. It corresponds to the mouth of the face.

  Note that the content of the first display object 21 formed by the combination of the plurality of display areas 12 and 13a to 13c is not particularly limited, and examples thereof include characters, symbols, marks, illustrations, characters, photographs, and the like. Various character information such as a picture, a company name, a product name, a selling point, a catch phrase, and an instruction manual can be listed.

  In addition, the number of display areas 12 and 13a to 13c is not particularly limited, but a complex design can be displayed as the first display object 21 as the number of display areas 12 and 13a to 13c increases. The number of display areas 12, 13a to 13c is preferably three or more.

  As shown in FIGS. 1B and 1C, at least one display region (in the illustrated example, all the display regions 12, 13a to 13c) displays the light incident from the point light source in the second display. It includes Fourier transform holograms 20R and 20Y that are converted into objects.

  In the present embodiment, the Fourier transform holograms 20R and 20Y are computer-generated holograms (CGH), which are two or more values (two-value, four-value, and eight) formed based on the image data of the original image to be displayed. This corresponds to a pattern of Fourier transform images when a plurality of Fourier transform images multi-valued to values,...) Are arranged in the vertical and horizontal directions up to a desired range.

  The contents of the second display object are not particularly limited, and for example, characters, symbols, marks, illustrations, characters, pictures, etc., company names, product names, sales points, catch phrases, instruction manuals, etc. Various character information can be listed.

  In the present embodiment, the Fourier transform holograms 20R and 20Y are transmission-type amplitude holograms. That is, in the Fourier transform holograms 20R and 20Y, the light and dark intensity distribution of the interference fringes is recorded as a change in shading, and diffraction is caused by the change in light transmittance to form a reproduced image that forms the second display object. It is supposed to be.

  As a material of the Fourier transform holograms 20R and 20Y, for example, a color resist material containing a photosensitive resin and a colorant can be used. This color resist material has a light transmittance lower than the light transmittance of the transparent substrate 11, and changes in shading occur depending on the presence or absence of the color resist material on the transparent substrate 11. The color resist material 11 may have zero light transmittance, that is, opaque.

  Examples of the photosensitive resin include acrylic resin, polyurethane resin, polyester resin, fluorine resin, silicone resin, epoxy resin, polyolefin resin, melamine resin, and vinyl chloride-vinyl acetate copolymer. Can be mentioned. Examples of the colorant include pigments such as inorganic pigments and organic pigments, acid dyes, direct dyes, disperse dyes, oil-soluble dyes, metal-containing oil-soluble dyes, dyes such as sublimation dyes, and the like.

  The color resist material may contain a flame retardant. This is because the display object 10 according to the present embodiment can also be used in applications that require flame retardancy such as lighting equipment. About the kind of flame retardant, it is the same as the flame retardant used with the above-mentioned transparent base material 11, and abbreviate | omits description. In addition, about the addition amount of a flame retardant, what is necessary is just the quantity which does not impair the optical characteristic of Fourier-transform hologram 20R, 20Y, and can be set suitably.

  The film thickness of the display regions 12, 13a to 13c is not particularly limited, and can be, for example, about 0.1 μm to 50 μm.

  Next, an example of a method for creating the display object 10 having such a configuration will be described with reference to FIGS. 5 and 6.

  First, as shown in FIG. 5A, an original image of the second display target 22 is prepared. In the illustrated example, a star-shaped mark is used as the second display object 22.

  Next, as shown in FIG. 5B, an original Fourier transform image 20 is created by calculation such as FFT (Fast Fourier Transform) using a computer. In the illustrated example, the Fourier transform image is a binarized Fourier transform image, but may be a Fourier transform image multi-valued to a value larger than the binary value (4 values, 8 values,...). . Further, in the illustrated example, in the Fourier transform image, the ratio of the width of one interference fringe to the distance (pitch) between adjacent interference fringes is set to 50%, but is set smaller than 50%. May be set, or may be set larger than 50%. In applications that require light transmission, such as windows and lighting fixtures, the smaller the ratio of the width of one interference fringe to the center-to-center distance (pitch) between adjacent fringes, the greater the average brightness of the display area. ,preferable.

  Next, as shown in FIG. 5C, using the created Fourier transform image 20, for each set of display regions 12, 13a to 13c, in which at least one of average hue, average brightness, and average saturation differs. Different photomasks 41 and 42 are formed. In the illustrated example, as the photomask 41 for the first display region 12, a plurality of interference fringe patterns composed of the Fourier transform image 20 are arranged in the region 41P corresponding to the first display region 12 in the vertical and horizontal directions, and other regions. Creates a uniformly open photomask. Further, as the photomask 42 for the second to fourth display regions 13a to 13c, a plurality of interference fringe patterns made of the Fourier transform image 20 are arranged in the region 42P corresponding to the second display regions 13a to 13c in the vertical and horizontal directions, In other regions, a photomask having uniform openings is created.

  Next, as shown in FIG. 6A, a positive color resist material 14 </ b> Y containing a yellow colorant is applied on the transparent substrate 11.

  Next, as shown in FIG. 6B, a photomask 41 for the first display region 12 is disposed so as to face the color resist material 14 </ b> Y on the transparent substrate 11, and ultraviolet rays are passed through the photomask 41. To expose the color resist material 14Y.

  Next, as shown in FIG. 6C, after the portion exposed to ultraviolet rays in the color resist material 14Y is dissolved and removed in the developer, the color resist 14Y remaining on the transparent substrate 11 is heated. To cure. Thereby, the first display area 12 including the Fourier transform hologram 20Y is formed.

  Next, as shown in FIG. 6D, a positive color resist material 14 </ b> R containing a red colorant is applied on the transparent substrate 11.

  Next, as shown in FIG. 6E, a photomask 42 for the second to fourth display regions 13a to 13c is arranged so as to face the color resist material 14R on the transparent substrate 11, and the photomask The color resist material 14 </ b> R is exposed by irradiating ultraviolet rays through 42.

  Next, as shown in FIG. 6F, after the portion exposed to the ultraviolet rays in the color resist material 14R is dissolved and removed in the developer, the color resist material 14R remaining on the transparent substrate 11 is heated. And let it harden. Thereby, the 2nd-4th display area 13a-13c containing the Fourier-transform hologram 20R is formed.

  In this way, the display object 10 as shown in FIGS. 1A to 1C and FIG. 2 can be obtained.

  Next, the operation of the present embodiment will be described with reference to FIGS.

  FIG. 3 is a diagram for explaining the first display object 21 displayed on the display object 10 using light from the surface light source 31. FIG. 4A is a diagram for explaining the second display object 22 displayed on the display object 10 using light from the point light source 32. FIG. 4B is a diagram for explaining the second display object 22 displayed on the display object 10 using light from the laser light source 33.

  As shown in FIG. 3, when an observer 35 observes a display object 10 that has been irradiated with light from a surface light source 31 such as a fluorescent lamp, a macroscopic shape formed by a combination of a plurality of display regions 12 and 13 a to 13 c. The first display object 21 (with the same scale as the entire display area) can be visually recognized. At this time, in the Fourier transform holograms 20R and 20Y included in the display areas 12, 13a to 13c, conversion to the second display object 22 occurs for each light emitted from each point of the surface light source. The optical image of the second display object 22 is superimposed over the entire shape of the surface light source, resulting in a non-optical image. For this reason, the optical image of the second display object 22 does not appear on the display object 10, and the observer 35 cannot visually recognize the second display object 22 that is microscopic (having a smaller scale than each display area). .

  On the other hand, as shown in FIG. 4A, when an observer 35 observes a display object 10 that has been irradiated with light from a point light source 32 such as an LED light source, Fourier transform holograms included in one display region 12, 13a to 13c. The light image of the second display object 22 is expressed on the display object 10 by the conversion of the incident light in 20R and 20Y, and the observer can visually recognize the microscopic second display object 22.

  Moreover, as shown in FIG. 4B, when the observer 35 observes the transmitted light of the display object 10 irradiated with light from the laser light source 33, the Fourier transform hologram 20R included in one display region 12, 13a to 13c. By the conversion of the incident light in 20Y, an optical image of the second display object 22 is developed on the irradiated surface of the transmitted light, and the observer can visually recognize the microscopic second display object 22.

  As described above, according to the present embodiment, the first display object 21 is formed by a combination of a plurality of display areas 12, 13a to 13c, and at least one display area 12, 13a to 13c is Further, Fourier transform holograms 20R and 20Y for converting light incident from the point light source 32 or the laser light source 33 into the second display object 22 are included. Therefore, the macroscopic first display object 21 is displayed in a place where the point light source 32 or the laser light source 33 is not present, but the point light source 32 or the laser light source 33 is present in the set of display areas 12 and 13a to 13c. The second microscopic display object 22 can be displayed. Thereby, although it is a simple structure, it can have various designability according to the presence or absence of the point light source 32 or the laser light source 33. FIG.

  Various changes can be made to the above-described embodiment. Hereinafter, modified examples will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as the above embodiment. The duplicated explanation is omitted. In addition, when it is clear that the operational effects obtained in the above-described embodiment can be obtained in the modified example, the description thereof may be omitted.

  In the example shown in FIGS. 1A to 1C, the average of the adjacent display areas is different because the hue, brightness, or saturation of the materials forming the Fourier transform holograms 20R and 20Y are different in the adjacent display areas. Although it was comprised so that a hue, average brightness, or average brightness may differ, it is not limited to this. For example, as shown in FIGS. 7A to 7C, in the display areas adjacent to each other, the hue, brightness, and saturation of the materials themselves that form the Fourier transform holograms 20 </ b> B and 20 </ b> F are the same, but adjacent interference. The ratio of the width of one interference fringe to the distance (pitch) between the centers of the fringes may be different, so that the average brightness of adjacent display areas may be different. Specifically, for example, in the Fourier transform hologram 20B shown in FIG. 7B, the ratio of the width of one interference fringe to the distance (pitch) between the centers of adjacent interference fringes is greater than 50%. Thereby, the average brightness of the 2nd-4th display area 13a-13c is reduced. On the other hand, in the Fourier transform hologram 20F shown in FIG. 7C, the ratio of the width of one interference fringe to the center-to-center distance (pitch) between adjacent interference fringes is made smaller than 50%. The average brightness of region 12 is increased. In this case, the hues of the display areas adjacent to each other may be the same or different.

  Effects similar to those of the above-described embodiment can also be obtained by the modes as shown in FIGS.

  Further, in the interference fringe pattern of the above embodiment, a change in shading (change in transmittance) occurs depending on the presence or absence of the color resist material on the transparent substrate 11, but is not limited thereto. A change in shading (change in transmittance) may occur due to a difference in concentration and thickness of the color resist material.

  Moreover, in the said embodiment, although Fourier-transform hologram 20R, 20Y, 20B, 20F was a transmission type hologram, it is not limited to this, A reflection type hologram may be sufficient. In this case, as shown in FIG. 8, when the display object 10 is observed under diffused light such as ceiling illumination or sunlight, a macroscopic first formed by a combination of a plurality of display regions 12, 13a to 13c. The display object 21 can be visually recognized. On the other hand, as shown in FIG. 9, when the reflected light of the display object 10 that has been irradiated with light from the laser light source 33 is observed, the incident light in the Fourier transform holograms 20R and 20Y included in one display region 12, 13a to 13c. As a result of the conversion, a light image of the second display object 22 appears on the display object 10, and the observer can visually recognize the microscopic second display object 22.

  Next, an application example of the display object 10 according to the above embodiment will be described.

  FIG. 10 shows an example of the security medium 51 provided with the display object 10 of the above embodiment. Here, the security medium 51 means an information storage medium in which high security is required, and includes, for example, an ID card such as a passport or a license, a card medium such as a cash card or a credit card, and the like.

  In the example shown in FIG. 10, the security medium 51 is an ID certificate such as a passport and includes the display object 10 according to the above embodiment. The display object 10 displays a face photograph of the owner of the ID certificate as the first display object 21 and the second display object 22.

  In the security medium 51 illustrated in FIG. 10, when the display object 10 is observed under diffused light such as ceiling lighting or sunlight, the observer displays the first display object 21 displayed in a combination of a plurality of display areas. It can be visually recognized.

  On the other hand, when the display object 10 is irradiated with the laser light L from the laser light source 33, the Fourier transform hologram included in the display area converts the laser light L into the second display object 22. Therefore, the observer can visually recognize the light image of the second display object 22. Further, when the security medium 51 is arranged between a point light source such as an LED and an observer, and the point light source is observed through the display object 10 included in the security medium 51, the observer emits light from the point light source. Thus, the second display object 22 displayed on the display object 10 can be visually recognized.

  Thus, the observer observing the security medium 51 can visually recognize the first display object 21 and the second display object 22 according to the presence or absence of a point light source or a laser light source. Therefore, the observer can prevent damage such as forgery of a face photograph by confirming the correspondence between the first display object 21 and the second display object 22, and particularly in the case of an ID certificate, Highly secure identity verification can be performed. In addition, since the display of the first display object 21 and the display of the second display object 22 are expressed by the same interference fringes, rewriting is difficult (for example, even if the first display object 21 is forged, 2 is not accompanied by display of the display object 22). Therefore, extremely high security can be ensured.

  Fig.11 (a) and FIG.11 (b) have shown an example of the window 52 provided with the display thing 10 of the said embodiment.

  A window 52 shown in FIGS. 11A and 11B is a stained glass, and includes the display object 10 according to the above-described embodiment. The display object 10 displays a plant pattern as the first display object 21 and displays a face illustration as the second display object 21.

  As shown to Fig.11 (a), the observer 35 who observes the window 52 indoors from the daytime can visually recognize the 1st display target 21 which the display thing 10 displays with the irradiation light from sunlight.

  On the other hand, as shown in FIG. 11 (b), the observer 35 who observes the window 52 from the indoors at night is the second that the display object 10 displays by irradiation light from the stars by the stars functioning as point light sources. The display object 22 can be visually recognized. Although illustration is omitted, when observing indoors and outdoors, the second display object 22 is visually recognized not only by stars but also by irradiation light from an outdoor point light source such as a night view, a street light, or a car light. be able to. Moreover, when observing indoors from the outdoors, the 2nd display object 22 can be visually recognized also with irradiation light from point light sources, such as LED illumination and a candle.

  Thus, the observer observing the window 52 can visually recognize the first display object 21 and the second display object 22 according to the presence or absence of a point light source. Therefore, the observer can enjoy various designs according to the passage of time without consuming energy such as electric power.

  FIGS. 12A and 12B show an example of a lighting fixture 53 provided with the display object 10 of the above embodiment.

  A luminaire 53 shown in FIGS. 12A and 12B is a table lamp and includes the display object 10 according to the above-described embodiment. The display object 10 is provided on the lamp shade of the lighting fixture 53, and displays a plant pattern as the first display object 21 and a star mark as the second display object 22.

  Further, in the lighting fixture 53, a diffused light source (a light source having a size) such as a fluorescent lamp and a point light source such as an LED are disposed inside the lamp shade, and can be switched on by switching with each other. ing.

  As shown in FIG. 12A, when the diffusion light source is turned on in the lighting fixture 53, the observer can visually recognize the first display object 21 displayed on the display object 10 by the irradiation light from the diffusion light source.

  On the other hand, as shown in FIG. 12B, when the point light source is turned on in the lighting fixture 53, the observer can visually recognize the second display object 22 displayed on the display object 10 by the irradiation light from the point light source. .

  Thus, the observer can visually recognize the first display object 21 and the second display object 22 according to the presence or absence of the point light source. Therefore, the observer can enjoy various designs at arbitrary timings by switching the switch while being the single lighting fixture 53.

  Note that the disclosed invention is not limited to the individual embodiments described above. Each embodiment can be appropriately combined as long as the processing contents do not contradict each other.

DESCRIPTION OF SYMBOLS 10 Display object 11 Transparent base material 12 Display area 13a Display area 13b Display area 13c Display area 14R Color resist material 14Y Color resist material 20 Fourier transform hologram 20R Fourier transform hologram 20Y Fourier transform hologram 20B Fourier transform hologram 20F Fourier transform hologram 21 1st Display object 22 Second display object 31 Surface light source 32 Point light source 33 Laser light source 41 Photomask 41P Area 42 corresponding to the first display area Photomask 42P Area 51 corresponding to the second to fourth display areas 51 Security medium 52 Window 53 Illumination Instrument

Claims (6)

With multiple display areas,
The display areas adjacent to each other are different in at least one of average hue, average brightness, and average saturation, and a first display object is formed by a combination of the plurality of display areas.
At least one display region includes a Fourier transform hologram for converting light incident from a point light source or a laser light source into a second display object. The display object according to claim 1, wherein the Fourier transform hologram is an amplitude hologram. The display object according to claim 1, wherein the number of the display areas is three or more. A security medium comprising the display object according to claim 1. A window comprising the display object according to claim 1. A lighting apparatus comprising the display object according to claim 1.